mam/sir, today i had unprotected sex (around 3pm) with my boyfriend, he came (ejaculated) in me. Nearly after 3 hours(5:45pm) i took unwanted 72. I took it for the first time. After sex i also went to toilet to pee and washed a little bit. I am in very much in tension now. 2 hours later i also had headache. Should i be worried? I dont want to become pregnant. What should i do now. What care should i take to not to become pregnant. Normally my period was about to start on 4 april and its 28 march today. please help me. If this pill fails, what will happen?, How will i know?,and what shoud i do to avoid pregnancy? Please someone help me as soon as possible.